Async Await Error Handling

async-error.js

run().
  catch(function handleError(err) {
    err.message; // Oops!
  }).
  // Handle any errors in `handleError()`. If the error handler
  // throws an error, kill the process.
  catch(err => { process.nextTick(() => { throw err; }) });

async function run() {
  await Promise.reject(new Error('Oops!'));
  // alternative
  // Note that this is `return`, not `await`
  return Promise.reject(new Error('Oops!'));
}